Seasonal occurrence of the sorghum shoot fly (Atherigona soccata) on sorghum at Ambo.
1996
Fentahun Mengistu | Sineshaw Aysheshim
Seasonal occurrence of the sorghum shoot fly (Atherigona soccata) at Ambo was studied over a period of three years (1992-1994) both in the main and off seasons by planting a susceptible variety IS-9302 at monthly intervals. At twenty five days interval after seedling emergence, the number of total plants and those with deadheart symptom were recorded. Percentage of deadheart occurrence was analyzed in relation to monthly rainfall and daily average temperatures. It was found out that in the presence of a suitable stage of the host, A. soccata would be present throughout the year reaching peaks towards the end of March (42.2 percent), late September (83 percent) and mid-October (57.8 percent). It was also noted that at peak periods of A. soccata infestation, 15 percent seedling attack occurred for a short period of time by another species of shoot fly known as Diopsis sp. Nevertheless, statistically significant relationship was not found between the monthly fluctuation of the pest and meteorological data.
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